CT Softwash LLC - Power Washing & Roof CleaningAddress: 919 Colonel Ledyard Hwy, Ledyard, CT 06339Phone: (860) 993-9770PSI and GPM: Tend not to pass up the meaning of PSI (lbs . for each sq. inch) and GPM (gallon for every minute) values extra into the stress washer And just how they affect the cleaning approach. An extremely large PSI and GPM bene